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Measurement-based quantum computation in an optical setup shows great promise towards the implementation oflarge-scale quantum computation. The difficulty of measurement-based quantum computation lies in the preparation ofcluster state. In this paper, we propose the method of generating the large-scale cluster state, which is a platform formeasurement-based quantum computation. In order to achieve more complex quantum circuits, the preparation protocolof N-photon cluster state will be proposed as a generalization of the preparation of four- and five-photon cluster states.Furthermore, our proposal is experimentally feasible. 相似文献
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This article aims to provide a review on quantum walks. Starting form a basic idea of discrete-time quantum walks, we will review the impact of disorder and decoherence on the properties of quantum walks. The evolution of the standard quantum walks is deterministic and disorder introduces randomness to the whole system and change interference pattern leading to the localization effect. Whereas, decoherence plays the role of transmitting quantum walks to classical random walks. 相似文献
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针对目前常见广义椭偏仪变角结构多采用双电机驱动,且存在结构复杂、变角后光路存在偏离等问题,论文提出一种单电机驱动广义椭偏仪新的变角结构。该结构采用固定起偏臂,利用同步齿轮传动单电机驱动方式使载物台和检偏臂同步旋转,实现椭偏仪多角度测量。在传统卧式结构广义椭偏仪变角结构基础上,设置样品载物台和检偏臂1∶2同步传动,并通过Inventor运动仿真验证了本结构的可行性。论文提出的单电机驱动变角结构变角后不仅维持了变角前后的准直,而且其整体结构简单,极大地优化了椭偏仪变角的复杂度,在广义椭偏仪工程化进程中有比较重要的应用价值。 相似文献
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利用循环伏安法对我们新设计合成的两种二茂铁甲基二氧大环多胺化合物——1-二茂铁甲基-1,4,8,11-四氮杂环十三烷-5,7-二酮(简称FcCH2L1)和1-二茂铁甲基-1,4,7,11,14-五氮杂环十六烷-3,15-二酮(简称FcCH2L2)——的电化学性质进行了研究,包括酸碱度的影响以及它们对Zn2+,Ca2+,Cd2+,Cu2+,Ni2+,Co2+等金属离子的电化学响应情况.在乙醇和水的混合溶剂体系中化合物FcCH2L1对Ni2+具有选择性络合,而化合物FcCH2L2对高氧化态的Ni3+有稳定作用 相似文献
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针对现有激光告警系统中因数据处理不及时导致漏警、响应速度慢的问题,提出了一种基于投影分割的光斑中心快速提取算法,根据衍射图像中各级光斑横向均匀分布的特点,提出先向坐标轴投影,再分别计算光斑中心坐标,实现快速提取的方法。将该算法部署到FPGA硬件系统,使告警系统能够在一帧图像传输周期内完成光斑中心坐标提取任务,提高了图像处理效率,进而实现高效告警。经实验证明,该算法光斑中心坐标提取最大误差为1个像素,告警系统响应时间为17.453 ms。该方法通过优化图像处理算法,缩短了告警设备响应时间,实现了对来袭激光快速、准确的告警。
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车辆与轨道相对振动状态对轨道线形测量有重要影响;分析了传统检测车辆与轨道相对振动状态测量方法的缺陷,提出一种基于视觉的车轨相对振动状态测量方法,以轨道建立世界坐标系,以车体建立车体坐标系。考虑相机镜头畸变,建立相机非线性模型,基于机器人手眼方法标定相机与车体,求解相机内外参数。依据车体运动姿态特征,推导基于双目机器视觉的车辆运动姿态偏移补偿计算方法;运用实验平台设计验证实验,通过计算所得的车体振动位移与真实值高度吻合,随着车速增加振动位移误差也随之增大,验证了该方法的正确性和可行性;提供一种车辆与轨道相对振动状态测量方法。 相似文献
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Quantum walk is different from random walk in reversibility and interference. Observation of the reduced re- versibility in a realistic quantum walk is of scientific interest in understanding the unique quantum behavior. We propose an idea to experimentally investigate the decoherence-induced irreversibility of quantum walks with trapped ions in phase space via the average fidelity decay. By introducing two controllable decoherence sources, i.e., the phase damping channel (i.e., dephasing) and the high temperature amplitude reservoir (i.e., dissipation), in the intervals between the steps of quantum walk, we find that the high temperature amplitude reservoir shows more detrimental effects than the phase damping channel on quantum walks. Our study also shows that the average fidelity decay works better than the position variance for characterizing the transition from quantum walks to random walk. Experimental feasibility to monitor the irreversibility is justified using currently available techniques. 相似文献
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We study the spin squeezing property of weighted graph states,which can be used to improve sensitivity in interferometry.We study the time evolution of spin squeezing under local decoherence acting independently on each qubit.Based on the analysis,the spin squeezing of the weighted graph states is somehow robust in the presence of decoherence and the decoherence limit in the improvement of the interferometric sensitivity is still achievable.Furthermore,one can obtain the optimal improvement of sensitivity by tuning the weighted of each edges of the weighted graph state. 相似文献